Texas Instruments TLC7705IPWRG4

Overview

TLC7705IPWRG4 from Texas Instruments is a micropower supply voltage supervisor IC with fixed 4.55 V sense threshold, active-low RESET output, programmable delay via external capacitor, and operation across 2 V to 6 V supply range. It provides power-on reset generation, undervoltage supervision, and power-down control for static RAM with battery backup-used in medical imaging systems requiring reliable low-power reset assurance.

For engineers reviewing the TLC7705IPWRG4 datasheet, TLC7705IPWRG4 pinout, TLC7705IPWRG4 application, or TLC7705IPWRG4 equivalent, key selection criteria include its 4.55 V threshold accuracy (±2%), 16 µA max supply current, DRB package thermal performance, and compatibility with battery-backed memory retention circuits per Figure 10 of SLVS087M.

Technical Context

The TLC7705IPWRG4 implements a precision bandgap-based voltage reference with temperature compensation to maintain stable 4.55 V threshold over –40°C to 125°C. Its internal timer generates a user-programmable reset delay (td = 2.1 × 10⁴ × CT) after SENSE voltage recovers above threshold.

It features dual-output logic: active-low RESET and active-high RESET̅, both with totem-pole drive capability (2 mA sink/source), defined output states down to VDD ≥1 V, and support for CONTROL pin-driven power-down mode in static RAM applications.

Key Specifications

Pinout & Package

Package: 8-pin SON (DRB), 3 mm × 3 mm, 0.5 mm pitch, exposed thermal pad - optimized for compact PCB layout and thermal dissipation in space-constrained medical imaging modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TLV803EB29DBVR and TPS3808G33DBVR, the TLC7705IPWRG4 offers fixed 4.55 V accuracy with dual active outputs and integrated power-down control-making it uniquely suited for 5 V systems requiring deterministic reset behavior and battery-backed memory retention without external logic.

Availability

TLC7705IPWRG4 is available at Aetrix Electronics and suitable for medical imaging, industrial PLCs, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TLC7705IPWRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade qualification.

The TLC77xx family was designed specifically for micropower voltage supervision in safety-critical and battery-sensitive applications-including medical, aerospace, and industrial control-where deterministic reset timing and low-IQ operation are mandatory.

FAQ

What is the exact sense threshold voltage of the TLC7705IPWRG4?

The TLC7705IPWRG4 has a nominal sense threshold voltage of 4.55 V, with a guaranteed tolerance of ±2% over temperature and supply voltage (2 V to 6 V). This value is fixed internally and does not require external resistor programming-unlike the TLC7701 variant. The hysteresis is 70 mV, enhancing noise immunity in electrically noisy environments where the TLC7705IPWRG4 is commonly deployed.

How is the reset delay time set for the TLC7705IPWRG4?

The reset delay time (td) for the TLC7705IPWRG4 is set externally using a single capacitor (CT) connected between the CT pin and ground. The relationship is td = 2.1 × 10⁴ × CT, where CT is in farads and td is in seconds. For example, a 100 nF capacitor yields ~2.1 ms delay. No resistor is needed-this simplifies design and improves timing accuracy compared to RC-based alternatives.

Does the TLC7705IPWRG4 support battery-backed static RAM power-down control?

Yes, the TLC7705IPWRG4 supports battery-backed static RAM power-down control via its CONTROL pin. When CONTROL is tied to GND, the RESET output becomes active-high, enabling direct connection to the chip-select (CS) input of battery-backed SRAM. This feature is explicitly documented in TI's Figure 10 and allows automatic memory disable during main power failure-preserving data without firmware involvement.

What is the operating temperature range for the TLC7705IPWRG4?

The TLC7705IPWRG4 is rated for operation from –40°C to 125°C, qualifying it for extended industrial and automotive under-hood applications. This range is confirmed in the "AVAILABLE OPTIONS" table of SLVS087M, where the "Q" suffix denotes the –40°C to 125°C grade, and the PW package (TSSOP) is specified for this temperature range in TI's packaging addendum.

Can the TLC7705IPWRG4 be used with supply voltages below 2 V?

No-the absolute minimum recommended supply voltage for the TLC7705IPWRG4 is 2 V, per the "RECOMMENDED OPERATING CONDITIONS" table in SLVS087M. While RESET is defined down to VDD ≥1 V for power-up assertion, functional operation-including accurate threshold sensing, delay timing, and output drive-requires VDD ≥2 V. Operation below 2 V may result in undefined behavior or failure to meet datasheet specifications.